FFmpeg
teeproto.c
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1 /*
2  * Tee output protocol
3  * Copyright (c) 2016 Michael Niedermayer
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "libavutil/avstring.h"
23 #include "libavutil/opt.h"
24 #include "avformat.h"
25 #include "avio_internal.h"
26 #include "tee_common.h"
27 
28 typedef struct ChildContext {
30 } ChildContext;
31 
32 typedef struct TeeContext {
33  const AVClass *class;
36 } TeeContext;
37 
38 static const AVOption tee_options[] = {
39  { NULL }
40 };
41 
42 static const AVClass tee_class = {
43  .class_name = "tee",
44  .item_name = av_default_item_name,
45  .option = tee_options,
46  .version = LIBAVUTIL_VERSION_INT,
47 };
48 
49 static const char *const child_delim = "|";
50 
51 static int tee_write(URLContext *h, const unsigned char *buf, int size)
52 {
53  TeeContext *c = h->priv_data;
54  int i;
55  int main_ret = size;
56 
57  for (i=0; i<c->child_count; i++) {
58  int ret = ffurl_write(c->child[i].url_context, buf, size);
59  if (ret < 0)
60  main_ret = ret;
61  }
62  return main_ret;
63 }
64 
65 static int tee_close(URLContext *h)
66 {
67  TeeContext *c = h->priv_data;
68  int i;
69  int main_ret = 0;
70 
71  for (i=0; i<c->child_count; i++) {
72  int ret = ffurl_closep(&c->child[i].url_context);
73  if (ret < 0)
74  main_ret = ret;
75  }
76 
77  av_freep(&c->child);
78  c->child_count = 0;
79  return main_ret;
80 }
81 
82 static int tee_open(URLContext *h, const char *filename, int flags)
83 {
84  TeeContext *c = h->priv_data;
85  int ret, i;
86 
87  av_strstart(filename, "tee:", &filename);
88 
89  if (flags & AVIO_FLAG_READ)
90  return AVERROR(ENOSYS);
91 
92  while (*filename) {
93  char *child_string = av_get_token(&filename, child_delim);
94  char *child_name = NULL;
95  void *tmp;
97  if (!child_string) {
98  ret = AVERROR(ENOMEM);
99  goto fail;
100  }
101 
102  tmp = av_realloc_array(c->child, c->child_count + 1, sizeof(*c->child));
103  if (!tmp) {
104  ret = AVERROR(ENOMEM);
105  goto loop_fail;
106  }
107  c->child = tmp;
108  memset(&c->child[c->child_count], 0, sizeof(c->child[c->child_count]));
109 
110  ret = ff_tee_parse_slave_options(h, child_string, &options, &child_name);
111  if (ret < 0)
112  goto loop_fail;
113 
114  ret = ffurl_open_whitelist(&c->child[c->child_count].url_context, child_name, flags,
115  &h->interrupt_callback, &options,
117  h);
118 loop_fail:
119  av_freep(&child_string);
120  av_dict_free(&options);
121  if (ret < 0)
122  goto fail;
123  c->child_count++;
124 
125  if (strspn(filename, child_delim))
126  filename++;
127  }
128 
129  h->is_streamed = 0;
130  for (i=0; i<c->child_count; i++) {
132  }
133 
134  return 0;
135 fail:
136  tee_close(h);
137  return ret;
138 }
140  .name = "tee",
141  .url_open = tee_open,
142  .url_write = tee_write,
143  .url_close = tee_close,
144  .priv_data_size = sizeof(TeeContext),
145  .priv_data_class = &tee_class,
146  .default_whitelist = "crypto,file,http,https,httpproxy,rtmp,tcp,tls"
147 };
#define NULL
Definition: coverity.c:32
int ffurl_open_whitelist(URLContext **puc, const char *filename, int flags, const AVIOInterruptCB *int_cb, AVDictionary **options, const char *whitelist, const char *blacklist, URLContext *parent)
Create an URLContext for accessing to the resource indicated by url, and open it. ...
Definition: avio.c:306
AVOption.
Definition: opt.h:246
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
static const char *const child_delim
Definition: teeproto.c:49
int ffurl_write(URLContext *h, const unsigned char *buf, int size)
Write size bytes from buf to the resource accessed by h.
Definition: avio.c:419
int is_streamed
true if streamed (no seek possible), default = false
Definition: url.h:45
static const AVClass tee_class
Definition: teeproto.c:42
AVIOInterruptCB interrupt_callback
Definition: url.h:47
#define AVIO_FLAG_READ
read-only
Definition: avio.h:674
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:191
static int tee_write(URLContext *h, const unsigned char *buf, int size)
Definition: teeproto.c:51
int child_count
Definition: teeproto.c:34
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
AVOptions.
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
URLContext * url_context
Definition: teeproto.c:29
ptrdiff_t size
Definition: opengl_enc.c:100
void * av_realloc_array(void *ptr, size_t nmemb, size_t size)
Definition: mem.c:198
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
const char * protocol_whitelist
Definition: url.h:49
void av_dict_free(AVDictionary **pm)
Free all the memory allocated for an AVDictionary struct and all keys and values. ...
Definition: dict.c:203
#define fail()
Definition: checkasm.h:122
char * av_get_token(const char **buf, const char *term)
Unescape the given string until a non escaped terminating char, and return the token corresponding to...
Definition: avstring.c:149
static int tee_close(URLContext *h)
Definition: teeproto.c:65
ChildContext * child
Definition: teeproto.c:35
int ff_tee_parse_slave_options(void *log, char *slave, AVDictionary **options, char **filename)
Definition: tee_common.c:32
static const AVOption tee_options[]
Definition: teeproto.c:38
int ffurl_closep(URLContext **hh)
Close the resource accessed by the URLContext h, and free the memory used by it.
Definition: avio.c:442
const char * protocol_blacklist
Definition: url.h:50
Definition: tee.c:52
void * buf
Definition: avisynth_c.h:766
Definition: url.h:38
Describe the class of an AVClass context structure.
Definition: log.h:67
void * priv_data
Definition: url.h:41
const char * name
Definition: url.h:55
#define flags(name, subs,...)
Definition: cbs_av1.c:561
static int tee_open(URLContext *h, const char *filename, int flags)
Definition: teeproto.c:82
const URLProtocol ff_tee_protocol
Definition: teeproto.c:139
int av_strstart(const char *str, const char *pfx, const char **ptr)
Return non-zero if pfx is a prefix of str.
Definition: avstring.c:34
Main libavformat public API header.
const OptionDef options[]
Definition: ffmpeg_opt.c:3374
#define av_freep(p)
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
static uint8_t tmp[11]
Definition: aes_ctr.c:26